"You! You should know better!" is how Michael Moore, the Secretary of State for Scotland, recalls me greeting him when he first arrived in parliament, newly elected, and several years after we had first worked together as researchers.
And it's true. I can't bear it when friends of mine stand for parliament. I go out of my way to dissuade them. I hate watching them being torn apart in the media or in that vile snakepit, the Commons chamber. I would like all my friends to live cocooned in safe, secure obscurity. But with Mike, as with some others, I have been proved wrong.
He is the least-known Lib Dem in the cabinet, elevated to it after the David Laws fallout last year. Of all the politicians I know, he remains the person whose feet are most firmly on the ground. Just as well, considering his height.
He has been criticised for being too cautious. Some Scottish Liberal Democrats would like him to go on the attack more often, but that is simply not his style. Mike is not from the Flashman school of politics and to criticise him for that is unfair. He is not in this game for the thrill – he is there to get results and make a difference.
In this, he reminds me of Alistair Darling, whom most people can barely remember from the early years of his career, but who by the end of 13 years in cabinet had widespread respect. Like Darling, Mike is bright, pays attention to detail, and has grown into the job.
His tireless campaigning in the recent Scottish Parliament election campaign has won him a lot of respect in the Scottish party. He will need to rely on that as Alex Salmond attempts to drive a wedge between Moore in Westminster and the new Scottish Liberal Democrat Leader, Willie Rennie. But Mike and Willie know each other well, get on, and understand the way this will work.
I loved a recent story about some hoo-ha on a political scandal-mongering website. Michael's name was in the frame. He walked into the Scotland Office unable to find any of his key staff. Eventually he found them in a meeting room worrying about how to rebut the story. "We know it isn't true, so can we just on with the real job at hand," he said. Typical Michael.
When he was stung like Vince Cable by the Telegraph's honeytrap , not only were his answers great, but he didn't hide away. Instead, he went on air and justified standing up for Liberal Democrat values.
But Moore now faces a critical test. With a single party in power, since the SNP's unexpected outright election victory, the Scotland Office is in a pivotal position between the UK government and the Scottish Executive.
He has been thrust further into the limelight, as the Scotland Bill must now go through Holyrood for a second time. Its first passage was supported by the SNP, but the second passage is an obvious opportunity for First Minister Salmond to start flexing his muscles.
The potential for meltdown between Westminster and Holyrood is significant, but Moore has taken this in his stride, turning the tables on the Scottish government and rightly asking it for a detailed case for the changes they want. After all, he delivered a Scotland Bill where Labour produced only a white paper and the Tory manifesto promised not much more.
But what looked like a substantial package of new powers, likely to get though without controversy, has become a hot potato with the spectre of an eventual independence referendum looming.
Labour and the Tories won't want much in the way of further devolution in the House of Commons, making Michael's strategic role all the more significant. His accountant's mind has the forensic abilities to navigate this difficult bill. And he has a calm and reassuring Commons style that is a tribute to his Presbyterian minister father.
During the final years of Labour's rule in Westminster, Alistair Darling faced up to Gordon Brown, in the interests not of his party, but his country. Michael Moore has the ability and the character to do the same . . . whether facing Westminster or Holyrood.
The fifth man is stepping into the light.